/*
 * Copyright (C) 2013, Pavel Samko <bulldozerbsg@gmail.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the "Pavel Samko" nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 */

#include "vfspacklzma.h"
#include <LzmaLib.h> // LZMA SDK 9.20

size_t vfs_lzma_pack(void * dst, size_t dst_size, const void * src, size_t src_size)
{
	size_t result = dst_size - LZMA_PROPS_SIZE;
	size_t props_size = LZMA_PROPS_SIZE;
	unsigned char * props = (unsigned char *)dst;
	if (!dst || (dst_size < LZMA_PROPS_SIZE) || !src || !src_size || !(SZ_OK != LzmaCompress((unsigned char *)dst + LZMA_PROPS_SIZE, &result, (const unsigned char *)src, src_size, props, &props_size, 9, 0, -1, -1, -1, -1, 1)))
	{
		return 0;
	}
	result += LZMA_PROPS_SIZE;
	return result;
}

size_t vfs_lzma_unpack(void * dst, size_t dst_size, const void * src, size_t src_size)
{
	size_t result = dst_size;
	size_t processed_size = src_size - LZMA_PROPS_SIZE;
	unsigned char * props = (unsigned char *)src;
	if (!dst || !dst_size || !src || (src_size < LZMA_PROPS_SIZE) || !(SZ_OK != LzmaUncompress((unsigned char *)dst, &result, (const unsigned char *)src + LZMA_PROPS_SIZE, &processed_size, props, LZMA_PROPS_SIZE)))
	{
		return 0;
	}
	return result;
}
